Ammonia → 9-Cyano 10,11-dihydro-11-oxo-dibenzo[b,f]thiepin

Participants

Reaction Conditions

Reaction Steps

The mixture of 2.6g of 9-chloro-10,11-dihydro-11-oxo-dibenzo-[b,f]thiepin, 2.0g of copper cyanide, 0.1g of anhydrous copper sulfate and 50ml of N-methyl pyrrolidone was heated with stirring at 200° C overnight in a flask equipped with a tube packed with silica gel. After cooling, to the reaction mixture were added 100ml of conc. aqueous ammonia and 200ml of water, and the resulting mixture was extracted with benzene. The extract was washed with water, diluted hydrochloric acid and then water, which was dried over potassium sulfate and the solvent evaporated therefrom. The residue thus obtained was chromatographed on 200g of silica gel, and eluted with chloroform/methanol (50/1). 0.6g of the starting material was recovered from a first eluate. Recrystallization of the residue of a second eluate from benzene gave 0.7g of 9-cyano 10,11-dihydro-11-oxo-dibenzo[b,f]thiepin as pale yellow prismatic crystals having a melting point of 165°-167° C.

Provenance & Evidence